Same argument could be made in that snow tires have worse handling and braking in temps above 40. I'll take my chances here in Kansas City where snow is usually removed from the roads within a few hours and rarely does the snow total more than 2 to 4 inches and this might happen 5 to 10 times annually. For here, snow tires are pointless. If I lived in a snowy climate, I'd have snow tires.

In theory you should be buying tires that suit the worst conditions you are likely to drive in. Winter tires on dry pavement are probably about 95% as good as all-seasons, but all-seasons on snow are probably only about 50% as good as winter tires.